ABSTRACT
Abrasives used in high velocity water jet cutting systems are one of the most important elements for kerf opening. The most commonly used product as an abrasive is mineral garnet. Many of its technological characteristics are very important. The common characteristics that influence the cutting system were defined as abrasive power and among these features there are grain size distribution, abrasive hardness, geometrical form of the particles, and other features that will be presented. Different grain sizes are available to provide best cutting features for different materials. Operation with softer materials such as wood and rubber do not require the use of abrasives, but for cutting hard rocks, as well as steel, other metals and ceramics, the use of abrasives is mandatory. Garnet is the most commonly used abrasive, but there are other natural and man made abrasives such as slag, aluminium oxide and carborundum that may be used. Careful selection of the abrasive material is recommended to achieve a compromise between nozzle durability and the part to be machined.
